| 摘要 |
A vehicle seat occupant presence and position sensing system for vehicles equipped with air bags comprises means for measuring the magnitude and Q of capacitance between electrodes in the seat. The magnitude and Q are combined by a microprocessor to characterize the seat occupant and, if the occupant is a person, ascertain the distance of the back of the person from the back of the seat thereby distinguishing between a seat occupied by a normally seated person and certain other circumstances in which deployment of air bags is not desired. A microprocessor prevents air bag deployment when the seat has not held a normally seated person immediately prior to an accident. The position of the occupant relative to the seat, the track position and recline angle of the vehicle seat and vehicle deceleration during a crash are used to estimate the position of the occupant relative to a deploying air bag during the crash. Knowing the position of the occupant enables a highly accurate determination of the best usage to make of an air bag.
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